NY State Sales Tax by Zip Code

I'm building a new site and want to use HikaShop over Virtuemart for many reasons, only one of which is having to modify the source to get Virtuemart to charge NY Sales Tax. I've read several threads on this forum about setting up sales tax, but I want to take the simplest approach if possible.

I'm only selling in the U.S. and will only charge tax for shipments within NY State. Tax rate by zip is how I need to calculate it and I have a table of 2238 rows with the zip code and tax rate.

From what I've read I think this is what I need to do, but I'm not sure.

1. Set the "address_post_code" to "Zone"
2. Create a new tax category for New York
3. Create a set of 2238 rates with the zip code as the "Tax namekey" and the percentage as the "Rate"

I can import the rates from CSV once I see how the first is stored.

I'm ready to buy the software but need to know if I can get this to work, and if this is the way to do it.

Thank you so much. I've read how awesome your support is.
Michael